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Cooling crystallization process via hollow fiber membrane promoted nucleation

Authors： HE Zeman, XIAO Wu, HE Gaohong, JIANG Xiaobin

Units： State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Dalian University of Technology, Dalian 116024, Liaoning, China

KeyWords： cooling crystallization; membrane crystallizer; heterogeneous nucleation; crystal seeds

ClassificationCode：TQ028

year,volume(issue):pagination： 2020,40(4):80-86

Abstract：

Cooling crystallization is a widely used separation technology, which has the advantages of low energy consumption and environmental friendliness. At present, the spontaneous nucleation of the solution gradually cooling is difficult to control with high precision; artificial seed addition can improve the quality of the cooling crystallization product; however, it cannot be automated. This paper used the high heat exchange area and excellent heat transfer capacity of hollow fiber membrane modules to achieve rapid cooling at the membrane interface to promote nucleation, thereby completing the automatic nucleation and seed addition functions of cooling crystallization. In this study, thiourea aqueous solution was used as the research system to study the cooling crystallization process of PTFE hollow fiber membranes. The results showed that the time to induce nucleation with membrane was 195 s, and the induction time to cooling crystallization of spontaneous nucleation without membrane participation was 280 s. In addition, at the same temperature, raw material concentration, and stirring speed, the use of the membrane to promote the nucleation of the cooling crystallization can effectively regulate the number and rate of seed production and achieve automatic transportation. Therefore, the quality of the prepared crystal product is excellent, the crystal morphology is complete, the purity is high (>99.5 wt%), the average crystal particle size is large (>1.35 mm), and the particle size distribution is narrower. This novel cooling crystallization method provides a new approach for the optimization and design of the cooling crystallization process.

Funds：

国家自然科学基金国家重大科研仪器研制项目（21527812），面上项目（21676043）

AuthorIntro：

第一作者简介：何泽漫（1995-），女，河南驻马店人，硕士研究生，从事膜冷却结晶，E-mail：1449891012@qq.com。 *通讯作者，姜晓滨（1984-），男，教授，从事化工分离和膜结晶过程研究，E-mail：xbjiang@dlut.edu.cn。

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